solar pv standard plan - simplified - ladbs · solar pv standard plan - simplified ... at 120%...

SOLAR PV STANDARD PLAN - SIMPLIFIED Central/String Inverter Systems for One and Two Family Dwellings

Solar PV Central Standard Plan 1 V 1.0 -11/2016 2014 NEC Plan Reviewer Initials: ______

SCOPE: Use this plan ONLY for electrical review of utility-interactive central/string inverter systems not exceeding a combined system AC inverter output of 10kW on the roof of a single or duplex family dwelling or accessory building. The specific structural and fire requirements are covered under a separate permit. The photovoltaic system must interconnect to the load side of a single-phase AC service panel of 240Vac or less with a busbar rating of 225A or less. This plan is not intended for bipolar systems, hybrid systems or systems that

utilize storage batteries, charge controllers, trackers, ac modules, more than two inverters or more than one DC

combiner (non-inverter-integrated) per inverter. Systems must be in compliance with current California Building Standards Codes and all applicable Los Angeles Codes. Other Articles of the California Electrical Code (CEC) shall apply as specified in 690.3. MANUFACTURER’S SPECIFICATION SHEETS MUST BE PROVIDED for proposed inverters, modules, combiner/junction boxes, racking systems, and rapid shutdown system or equipment. Installation instructions for bonding and grounding equipment and rapid shutdown systems shall be provided, and local AHJs may require additional details. Listed and labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling (CEC 110.3). Equipment intended for use with PV system shall be listed for the PV application (CEC 690.4(B)).

Job Address: _____________________________________ Permit #: _________________________________

Contractor/ Engineer Name: ________________________ License # and Class: ________________________

Signature: ________________________ Date: __________ Phone Number: ___________________________

Total # of Inverters installed: ____________ (If more than one inverter, complete and attach the “Supplemental

Calculation Sheets” starting on page 8 & “Load Center Calculations” on page 13 if a new load center is to be used)

Inverter 1 AC Output Power Rating: ___________Watts Inverter 2 AC Output Power Rating (if applicable): ___________Watts Combined Inverter Output Power Rating: ___________ ≤ 10,000 Watts

Site Conditions:

Ambient Temperature Adjustment Factors: select the box for the expected lowest ambient temperature (TL) with the corresponding Ambient Temperature Correction Factor (CF):

1) If TL is greater than or equal to -5°C, CF = 1.12

If TL is between -6°C and -10°C, CF = 1.14

Average ambient high temperature (TH) ≤ 47° C

Note: For a lower TL or a higher TH, this plan is not applicable.

DC Information:

Module Manufacturer: _________________________________ Model: _____________________

2) Module VOC (from module nameplate): ____Volts

3) Module ISC (from module nameplate): ____ Amps Is Module ISC below 9.6 Amps? Yes No (If No, this plan is not applicable.)

4) Module DC output power under standard test conditions (STC) = ________ Watts (STC)



5) DC Module Layout Identify each source

circuit (string) for inverter 1 shown on the

roof plan with a Tag (e.g. A,B,C,…)

Number of modules per source circuit for

inverter 1

Identify, by tag, which source circuits on the roof are to be paralleled (if none, put N/A)

Combiner 1:

Combiner 2:

Total number of source circuits:

6) Are DC/DC Converters used? Yes No If No, skip to Step 7. If Yes enter info below.

DC/DC Converter Model #:______________ Max DC Output Current: ________________ Amps Max # of DC/DC Converters in an Input Circuit: ______

DC/DC Converter Max DC Input Voltage: Volts Max DC Output Current: Volts DC/DC Converter Max DC Input Power: Watts

7) Maximum System DC Voltage Use for systems without DC/DC converters.

A. Module VOC (STEP 2) x # of modules in series (STEP 5) ______x CF (STEP 1) ________ = V

Table 1. Maximum Number of PV Modules in Series Based on Module Rated VOC for 600Vdc Rated Equipment (CEC 690.7)

Max. Rated Module VOC if CF = 1.12(Volts)

29.76 31.51 33.48 35.71 38.27 41.21 44.64 48.70 53.57 59.52 66.96 76.53 89.29

Max. Rated Module VOC if CF = 1.14(Volts)

29.24 30.96 32.89 35.09 37.59 40.49 43.86 47.85 52.63 58.48 65.79 75.19 87.72

Max # of Modules for 600 Vdc 18 17 16 15 14 13 12 11 10 9 8 7 6

Use for systems with DC/DC converters. The value calculated below must be less than DC/DC converter max DC input voltage (STEP 6).

B. Module VOC (STEP 2) ____ x # of modules per converter (STEP 6) ___x CF (STEP 1) _______ = ___ V

Table 2. Largest Module VOC for Single-Module DC/DC Converter Configurations (With 80V AFCI Cap) (CEC 690.7 and 690.11)

Max. Rated Module VOC if CF = 1.12 (Volts)

30.4 33.0 35.7 38.4 41.1 43.8 46.4 49.1 51.8 54.5 57.1 59.8 62.5 65.2 67.9 70.5

Max. Rated Module VOC if CF = 1.14 (Volts)

29.8 32.5 35.1 37.7 40.4 43.0 45.6 48.2 50.9 53.5 56.1 58.8 61.4 64.0 66.7 69.3

DC/DC Converter Max DC Input (STEP #6) (Volts)

34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79

8) Maximum System DC Voltage from DC/DC Converters to Inverter — Only required if Yes in Step 6 Maximum System DC Voltage = Volts

9) Sizing Source Circuit Conductors Source Circuit Conductor Size = Min. #10 AWG copper conductor, 90° C wet (USE-2, PV Wire, XHHW-2, THWN-2, RHW-2). For up to 8 conductors in roof-mounted conduit exposed to sunlight at least ½” from the roof covering. (CEC 310) Note: For over 8 conductors in the conduit or mounting height of lower than ½” from the roof, this plan is not applicable.



10) Are PV source circuits combined prior to the inverter? Yes No If No, use Single Line Diagram 1 and proceed to Step 12. If Yes, use Single Line Diagram 2 and proceed to Step 11 after this step. Is source circuit OCPD required? Yes No Source circuit OCPD size (if needed): 15 Amps Are the source circuits combined on the roof? Yes No If “Yes,” the DC output of the combiner shall have a load break disconnecting means located in the combiner or within 1.8m (6ft) of the combiner (CEC 690.15(C)).

11) Sizing PV Output Circuit Conductors — If strings are combined (answered “Yes” in Step 10), Output Circuit Conductor Size = Min. #6 AWG copper conductor.

12) Inverter DC Disconnect Does the inverter have an integrated DC disconnect? Yes No If Yes, proceed to step 13. If No, the external DC disconnect to be installed is rated for ____ Amps (DC) and ____ Volts (DC)

13) Inverter Information Manufacturer: Model: Max. Continuous AC Output Current Rating: Amps Integrated DC Arc-Fault Circuit Protection? Yes No (If No is selected, this plan is not applicable.) Grounded or Ungrounded System? Grounded Ungrounded

AC Information:

14) Sizing Inverter Output Circuit Conductors and OCPD Inverter Output OCPD rating = _______ Amps (Table 3) Inverter Output Circuit Conductor Size = _______ AWG (Table 3)

Table 3. Minimum Inverter Output OCPD and Circuit Conductor Size

Inverter Continuous Output Current Rating (Amps) (Step 13) 12 16 20 24 28 32 36 40 48

Minimum OCPD Size (Amps) 15 20 25 30 35 40 45 50 60

Minimum Conductor Size (AWG, 75° C, Copper) 14 12 10 10 8 8 6 6 6

15) Point of Connection to Utility Note: Only load side connections are permitted with this plan. Is the PV OCPD positioned at the opposite end from input feeder location or main OCPD location? Yes, use Table 4, row 3 and circle the Max Combined PV System OCPD(s) at 120% based on the bus bar rating and main OCPD values. No, use Table 4, row 4 and circle the Max Combined PV System OCPD(s) at 100% based on the bus bar rating and main OCPD values. Per 705.12(D)(2)(3): The value circled in Table 4 should be equal to or greater than the OCPD value selected from Table 3 (for a single inverter) or the OCPD value from Step S18 (for two inverters).

Table 4. Maximum Combined Supply OCPDs Based on Bus Bar Rating (Amps) per CEC 705.12(D)(2)(3)(b)

Bus Bar Rating 100 125 125 200 200 200 225 225 225

Main OCPD 100 100 125 150 175 200 175 200 225

Max Combined PV System OCPD(s) at 120% of Bus Bar Rating

20 50 25 60* 60* 40 60* 60* 45

Max Combined PV System OCPD(s) at 100% Bus Bar Rating

0 25 0 50 25 0 50 25 0

*This value has been lowered to 60 A from the calculated value to reflect 10 kW AC size maximum.

Reduction of the main breaker and/or interconnection to center-fed panelboards are not permitted with this plan.



16) Rapid Shutdown

The rapid shutdown initiation device shall be labeled according to CEC 690.56(C), and its location shall be shown on the site plan drawing. The rapid shutdown initiation device may be the inverter output or input circuits’ disconnecting means, the service main disconnect, or a separate device as approved by the AHJ. The disconnecting means shall be identified for the purpose, suitable for their environment, and listed as a disconnecting means. A single rapid shutdown initiation device shall operate all disconnecting means necessary to control conductors in compliance with CEC 690.12. Note: Check with the AHJ regarding approval where field verification of reduction of voltage within the time required by CEC 690.12 is performed.

Rapid shutdown shall be provided as required by CEC 690.12 with one of the following methods (Select one):

The inverter(s) is within 10 feet of the array, and the location of the inverter is such that uncontrolled PV system conductors are no greater than 5 feet of length within the building. A remotely-controlled AC disconnecting means is required immediately adjacent to or as close as practicable to the inverters, and located within 10 feet of the array.

The inverter(s) is within 10 feet of the array, and the location of the inverter is such that uncontrolled PV system conductors are no greater than 5 feet of length within the building. Reduction of the voltage for the inverter output within the time required by CEC 690.12 shall be verified in the field, or the inverter output is listed to UL 1741 with rapid shutdown capability.

Remotely-controlled DC disconnecting means are located within 10 feet of the PV array and DC input of the inverter(s), and the locations of the disconnecting means are such that uncontrolled PV system conductors are no greater than 5 feet of length within the building. Reduction of the voltage for the inverter output within the time required by CEC 690.12 shall be verified in the field, or the inverter output is listed to UL 1741 with rapid shutdown capability.

Remotely-controlled DC disconnecting means is located within 10 feet of the array at the DC input of inverter(s) connected to a module level DC-DC converter circuit where the DC-DC converter circuit meets the requirements for controlled conductors when disconnected from the inverter. Reduction of the voltage for the DC-DC converter output and the inverter output within the time required by CEC 690.12 shall be verified in the field, or the DC-DC converter output and the inverter output are listed to UL 1741 with rapid shutdown capability.

A UL 1741-listed and identified inverter(s) with input and output rapid shutdown capability supplying module level DC-DC converter circuit where the DC-DC converter circuit meets the requirements for controlled conductors when disconnected from the inverter.

A UL 1741-listed rapid shutdown system: Manufacturer: ________________________________________________________________ Testing Agency Name: __________________________________________________________ System Model Number: _________________________________________________________ System Components: ___________________________________________________________

17) Grounding and Bonding of Modules and Racking System (select one):

Racking system listed to UL 2703 using modules identified in the listing.

Other method subject to AHJ approval



Markings

CA Electrical Code (CEC) Articles 690 and 705 and CA Residential Code (CRC) Section R331 require the following labels or markings be installed at these components of the photovoltaic system:

WARNING

ELECTRIC SHOCK HAZARD. THE DC

CONDUCTORS OF THIS PHOTOVOLTAIC

SYSTEM ARE UNGROUNDED AND MAY

BE ENERGIZED

WARNING

INVERTER OUTPUT CONNECTION;

DO NOT RELOCATE THIS

OVERCURRENT DEVICE

CEC 690.31(G)(3)

[Marked on junction/combiner boxes

and conduit every 10’]

WARNING: PHOTOVOLTAIC

POWER SOURCE

J/Box

PV SYSTEM AC DISCONNECT

RATED AC OUTPUT CURRENT - ____AMPS

AC NORMAL OPERATING VOLTAGE ___VOLTS

M

A

C

INVERTER

D

C

WARNING

DUAL POWER SOURCES

SECOND SOURCE IS PHOTOVOLTAIC SYSTEM

RATED AC OUTPUT CURRENT- ____AMPS AC

NORMAL OPERATING VOLTAGE ___VOLTS

WARNING

ELECTRIC SHOCK HAZARD

DO NOT TOUCH TERMINALS

TERMINALS ON BOTH LINE AND LOAD

SIDES MAY BE ENERGIZED IN THE

OPEN POSITION

PV SYSTEM DC DISCONNECT

RATED MAX POWER-POINT CURRENT- ___ADC

RATED MAX POWER-POINT VOLTAGE- ___VDC

MAXIMUM CIRCUIT CURRENT- ___ADC

MAXIMUM SYSTEM VOLTAGE- ___VDC

CEC 705.12(D)(2)(3)(b)

[Not required if panelboard is rated not

less than sum of ampere ratings of all

overcurrent devices supplying it]

CEC 690.35(F)

[Only required for ungrounded systems]

CEC 690.54

CEC 690.53

CEC 690.17(E)

CEC 690.54 & CEC 705.12(D)(3)

WARNING

ELECTRIC SHOCK HAZARD

IF A GROUND FAULT IS INDICATED,

NORMALLY GROUNDED CONDUCTORS

MAY BE UNGROUNDED AND ENERGIZED

CEC 690.5(C)

[Normally already present on listed inverters]

Informational note: ANSI Z535.4 provides guidelines for the design of safety signs and labels for application to products. A phenolic

plaque with contrasting colors between the text and background would meet the intent of the code for permanency. No type size is

specified, but 20 point (3/8”) should be considered the minimum.

CEC 705.12 requires a permanent plaque or directory denoting all electric power sources on or in the premises and the rapid

shutdown initiation device.

PHOTOVOLTAIC SYSTEM EQUIPPED

WITH RAPID SHUTDOWN

CEC 690.56(C)

[Required at location approved by AHJ]

WARNING:

THIS EQUIPMENT FED BY MULTIPLE SOURCES.

TOTAL RATING OF ALL OVERCURRENT DEVICES,

EXCLUDING MAIN SUPPLY OVERCURRENT DEVICE,

SHALL NOT EXCEED AMPACTIY OF BUSBAR.

CEC 705.12(D)(2)(3)(c)

[Required on new load center if answered “No” to Step S21]



Solar PV Standard Plan – Simplified Central/String Inverter System for One- and Two-Family Dwellings

DESCRIPTION

SOLAR PV MODULE / STRING

DC/DC CONVERTERS INSTALLED? YES / NO (IF YES, STEPS 6 & 8 REQUIRED)

SOURCE CIRCUIT JUNCTION BOX INSTALLED?: YES / NO

SEPARATE DC DISCONNECT INSTALLED?: YES / NO

INTERNAL INVERTER DC DISCONNECT: YES / NO

CENTRAL INVERTER

LOAD CENTER INSTALLED?: YES / NO

PV PRODUCTION METER INSTALLED?: YES / NO

*SEPARATE AC DISCONNECT INSTALLED?: YES / NO

CONNECT TO INVERTER #2 (USE LINE DIAGRAM 2)

TAG12345678910

AC

DCG

MAIN SERVICE PANEL6 75

CB 1CB 1

CB 2CB 2

31

10

MAIN OCPD

G

9

PV OCPD

M

4

___ MODULES

___ MODULES

___ MODULES

___ MODULES

A DBC

TAG DESCRIPTION AND CONDUCTOR TYPECONDUCTOR

SIZE

NUMBER OF

CONDUCTORS

CONDUIT/CABLE

TYPECONDUIT SIZE

A USE-2 □ OR PV-WIRE □

EGC/GEC:

B

EGC/GEC:

C

EGC/GEC:

D

EGC/GEC:

CONDUCTOR/CONDUIT SCHEDULE

M

8

CHECK A BOX FOR WHETHER SYSTEM IS GROUNDED OR UNGROUNDED: GROUNDED (INCLUDE GEC)

REFER TO STEP 16 FOR RAPID SHUTDOWN DETAILS UNGROUNDED

ENTER “N/A” WHERE SUITABLE FOR WHEN NOT USING CONDUIT OR CABLE

AS PERMITTED BY CODE

2

IF DC/DC CONVERTERS ARE USED, CHECK THE BOX BELOW THE CORRESPONDING CONFIGURATION

PARALLEL DC/DC CONVERTERS ON ONE SOURCE CIRCUIT (FIXED UNIT VOLTAGE

DC/DC CONVERTERS)

DC/DC CONVERTERS ARE ALL RUN IN SERIES (FIXED SOURCE CIRCUIT

VOLTAGE DC/DC CONVERTERS)

+

+

-

-

+

+

-

-

INVERTER

DC

/DC

C

ON

VER

TER

S

DC

/DC

C

ON

VER

TER

S

FOR UNGROUNDED SYSTEMS:- DC OCPD MUST DISCONNECT BOTH CONDUCTORS OF EACH SOURCE CIRCUIT- UNGROUNDED CONDUCTORS MUST BE IDENTIFIED PER 210.5(C). WHITE-FINISHED CONDUCTORS ARE NOT PERMITTED.

+

-

+

-

INVERTER

SINGLE-LINE DIAGRAM #1 – NO STRINGS COMBINED PRIOR TO INVERTER

* Consult with your local AHJ and /or Utility




DESCRIPTION




COMBINER BOX (STEPS 11 & 12 REQUIRED)



CENTRAL INVERTER

LOAD CENTER INSTALLED?: YES / NO

PV PRODUCTION METER INSTALLED?: YES / NO


CONNECT TO INVERTER #2 (USE LINE DIAGRAM 4)

TAG1234567891011

AC

DC

G

MAIN SERVICE PANEL

7 86

CB 1CB 1

CB 2CB 2

31

11

MAIN OCPD

G

10

PV OCPD

M

5

___ MODULES

___ MODULES

___ MODULES

___ MODULES

ED

TAGDESCRIPTION AND

CONDUCTOR TYPE

CONDUCTOR

SIZE

NUMBER OF

CONDUCTORS

CONDUIT/CABLE

TYPECONDUIT SIZE

A1 USE-2 □ OR PV-WIRE □

EGC/GEC:

B1

EGC/GEC:

C

EGC/GEC:

D

EGC/GEC:

E

EGC/GEC:

COMBINER CONDUCTOR/CONDUIT SCHEDULE

M

9



ENTER “N/A” WHERE SUITABLE FOR WHEN NOT USING CONDUIT OR CABLE AS PERMITTED BY CODE

2

IF DC/DC CONVERTERS ARE USED, THEY ARE RUN IN SERIES (FIXED SOURCE

CIRCUIT VOLTAGE DC/DC CONVERTERS)

+

+

-

-

INVERTER

DC

/DC

C

ON

VER

TER

S


+

-

4

B1 CA1

SINGLE-LINE DIAGRAM #2 – COMBINING STRINGS PRIOR TO INVERTER

___ MODULES

___ MODULES

B2A2

TAGDESCRIPTION AND

CONDUCTOR TYPE

CONDUCTOR

SIZE

NUMBER OF

CONDUCTORS

CONDUIT/CABLE

TYPECONDUIT SIZE


EGC/GEC:

B2

EGC/GEC:

NON-COMBINED STRINGS CONDUCTOR/CONDUIT SCHEDULE (IF APPLICABLE)




Supplemental Calculation Sheets for Inverter #2 (Only include if second inverter is used)

DC Information:

Module Manufacturer: Model:

S2) Module VOC (from module nameplate): ____Volts

S3) Module ISC (from module nameplate): ____ Amps Is Module ISC below 9.6 Amps? Yes No (If No, this plan is not applicable.)

S4) Module DC output power under standard test conditions (STC) = Watts (STC)

S5) DC Module Layout

Identify each source circuit (string) for inverter 1 shown on the roof plan with a Tag

(e.g. A,B,C,…)

Number of modules per source circuit for inverter 1

Identify, by tag, which source circuits on the roof are to be paralleled (if none, put N/A)

Combiner 1:

Combiner 2:

Total number of source circuits for inverter 1:

S6) Are DC/DC Converters used? Yes No If No, skip to Step S7. If Yes, enter info below.

DC/DC Converter Model #:

Max DC Output Current: Amps

Max # of DC/DC Converters in an Input Circuit:

DC/DC Converter Max DC Input Voltage: Volts Max DC Output

Current: Volts DC/DC Converter Max DC Input

Power: Watts



S7) Maximum System DC Voltage Use for systems without DC/DC converters.

A. Module VOC (STEP S2) = x # of modules in series (STEP S5) ______x CF (STEP 1) _________ = V

Table S1. Maximum Number of PV Modules in Series Based on Module Rated VOC for 600Vdc Rated Equipment (CEC 690.7)

Max. Rated Module VOC (*1.12) (Volts)

29.76 31.51 33.48 35.71 38.27 41.21 44.64 48.70 53.57 59.52 66.96 76.53 89.29


29.24 30.96 32.89 35.09 37.59 40.49 43.86 47.85 52.63 58.48 65.79 75.19 87.72

Max # of Modules for 600 Vdc 18 17 16 15 14 13 12 11 10 9 8 7 6

Use for systems with DC/DC converters. The value calculated below must be less than DC/DC converter max DC input voltage (STEP 6).

B. Module VOC (STEP S2) = x # of modules per converter (STEP S6) ______x CF (STEP 1) _________ = V

Table S2. Largest Module VOC for Single-Module DC/DC Converter Configurations (With 80V AFCI Cap) (CEC 690.7 and 690.11)


30.4 33.0 35.7 38.4 41.1 43.8 46.4 49.1 51.8 54.5 57.1 59.8 62.5 65.2 67.9 70.5


29.8 32.5 35.1 37.7 40.4 43.0 45.6 48.2 50.9 53.5 56.1 58.8 61.4 64.0 66.7 69.3

DC/DC Converter Max DC Input (STEP #6) (Volts)

34 37 40 43 46 49 52 55 58 61 64 67 70 73 76 79

S8) Maximum System DC Voltage from DC/DC Converters to Inverter — Only required if Yes in Step S6 Maximum System DC Voltage = Volts

S9) Sizing Source Circuit Conductors Source Circuit Conductor Size = Min. #10 AWG copper conductor, 90° C wet (USE-2, PV Wire, XHHW-2, THWN-2, RHW-2) For up to 8 conductors in roof-mounted conduit exposed to sunlight at least ½” from the roof covering. (CEC 310) Note: For over 8 conductors in the conduit or mounting height of lower than ½” from the roof, this plan is not applicable.

S10) Are PV source circuits combined prior to the inverter? Yes No If No, use Single Line Diagram 1 with Single Line Diagram 3 and proceed to Step S12. If Yes, use Single Line Diagram 2 with Single Line Diagram 4 and proceed to Step S11 after this step.

Is source circuit OCPD required? Yes No Source circuit OCPD size (if needed): 15 Amps Are the source circuits combined on the roof? Yes No If “Yes,” the DC output of the combiner shall have a load breaker disconnecting means located in the combiner or within 1.8m (6ft) of the combiner.

S11) Sizing PV Output Circuit Conductors — If strings are combined (answered “Yes” in Step S10), Output Circuit Conductor Size = Min. #6 AWG copper conductor.

S12) Inverter DC Disconnect Does the inverter have an integrated DC disconnect? Yes No If Yes, proceed to Step S13. If No, the external DC disconnect to be installed is rated for Amps (DC) and Volts (DC)



S13) Inverter Information Manufacturer: Max. Continuous AC Output Current Rating: Amps

Model:

Integrated DC Arc-Fault Circuit Protection? Yes No (If No is selected, this plan is not applicable.) Grounded or Ungrounded System? Grounded Ungrounded

AC Information:

S14) Sizing Inverter Output Circuit Conductors and OCPD Inverter Output OCPD rating = Amps (Table 3) Inverter Output Circuit Conductor Size = AWG (Table 3)

Table S3. Minimum Inverter Output OCPD and Circuit Conductor Size

Inverter Continuous Output Current Rating (Amps) (Step 14) 12 16 20 24 28 32 36 40 48

Minimum OCPD Size (Amps) 15 20 25 30 35 40 45 50 60

Minimum Conductor Size (AWG, 75° C, Copper) 14 12 10 10 8 8 6 6 6

Load Center Calculations

(Omit if a load center will not be installed for PV OCPDs)

S18) Load Center Output: Calculate the sum of the maximum AC outputs from each inverter. Inverter #1 Max Continuous AC Output Current Rating [STEP S13] × 1.25 = Amps Inverter #2 Max Continuous AC Output Current Rating [STEP S13] × 1.25 = Amps Total inverter currents connected to load center (sum of above) = Amps Conductor Size: AWG Overcurrent Protection Device: Amps Load center bus bar rating: Amps Can the load center accept more than two breakers? Yes No If Yes, the sum of 125% of the inverter output circuit currents and the rating of the overcurrent device protecting the busbar shall not exceed 120% of the ampacity of the busbar. If No, the sum of ampere rating of the two PV overcurrent devices shall not exceed the rating of the busbar.




DESCRIPTION






CENTRAL INVERTER


TO LOAD CENTER ON LINE DIAGRAM 1

TAG12345678

AC

DC

6531 4

___ MODULES

___ MODULES

___ MODULES

___ MODULES

A B C

TAG DESCRIPTION AND CONDUCTOR TYPECONDUCTOR

SIZE

NUMBER OF

CONDUCTORS

CONDUIT/CABLE

TYPECONDUIT SIZE

A USE-2 □ OR PV-WIRE □

EGC/GEC:

B

EGC/GEC:

C

EGC/GEC:

CONDUCTOR/CONDUIT SCHEDULE



ENTER “N/A” WHERE SUITABLE FOR WHEN NOT USING CONDUIT OR CABLE AS

PERMITTED BY CODE

2

IF DC/DC CONVERTERS ARE USED, CHECK THE BOX BELOW THE CORRESPONDING CONFIGURATION

PARALLEL DC/DC CONVERTERS ON ONE SOURCE CIRCUIT (FIXED UNIT VOLTAGE

DC/DC CONVERTERS)

DC/DC CONVERTERS ARE ALL RUN IN SERIES (FIXED SOURCE CIRCUIT

VOLTAGE DC/DC CONVERTERS)

+

+

-

-

+

+

-

-

INVERTER

DC

/DC

C

ON

VER

TER

S

DC

/DC

C

ON

VER

TER

S


+

-

+

-

INVERTER

7

8

SINGLE-LINE DIAGRAM #3 – ADDITIONAL INVERTER FOR DIAGRAM #1

INVERTER # 2



Solar PV Central Standard Plan 12 V 1.0 -11/2016 2014 NEC

Plan Reviewer Initials: ______


DESCRIPTION




COMBINER BOX (STEPS 11 & 12 REQUIRED)



CENTRAL INVERTER


TO LOAD CENTER ON LINE DIAGRAM 3

TAG123456789

AC

DC

7631 5

___ MODULES

___ MODULES

___ MODULES

___ MODULES

D

TAGDESCRIPTION AND

CONDUCTOR TYPE

CONDUCTOR

SIZE

NUMBER OF

CONDUCTORS

CONDUIT/CABLE

TYPECONDUIT SIZE


EGC/GEC:

B1

EGC/GEC:

C

EGC/GEC:

D

EGC/GEC:

COMBINER CONDUCTOR/CONDUIT SCHEDULE



ENTER “N/A” WHERE SUITABLE FOR WHEN NOT USING CONDUIT OR CABLE AS PERMITTED BY CODE

2

IF DC/DC CONVERTERS ARE USED, THEY ARE RUN IN SERIES (FIXED SOURCE

CIRCUIT VOLTAGE DC/DC CONVERTERS)

+

+

-

-

INVERTER

DC

/DC

C

ON

VER

TER

S


+

-

4

B1 CA1

8

9

SINGLE-LINE DIAGRAM #4 – ADDITIONAL INVERTER FOR DIAGRAM #2

INVERTER # 2

TAGDESCRIPTION AND

CONDUCTOR TYPE

CONDUCTOR

SIZE

NUMBER OF

CONDUCTORS

CONDUIT/CABLE

TYPECONDUIT SIZE


EGC/GEC:

B2

EGC/GEC:

NON-COMBINED STRINGS CONDUCTOR/CONDUIT SCHEDULE (IF APPLICABLE)

___ MODULES

___ MODULES

B2A2



Solar PV Central Standard Plan 13 V 1.0 -11/2016 2014 NEC

Plan Reviewer Initials: ______

Items required: roof layout of all panels, modules, clear access pathways and approximate locations of electrical disconnecting means, roof access points, and rapid shutdown initiation device.

solar pv standard plan - simplified - ladbs · solar pv standard plan - simplified ... at 120%...

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